[SPARC]: constify of_get_property return: arch/sparc

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/kernel/time.c b/arch/sparc/kernel/time.c
index 9bb1240..f1401b5 100644
--- a/arch/sparc/kernel/time.c
+++ b/arch/sparc/kernel/time.c
@@ -301,7 +301,7 @@
 static int __devinit clock_probe(struct of_device *op, const struct of_device_id *match)
 {
 	struct device_node *dp = op->node;
-	char *model = of_get_property(dp, "model", NULL);
+	const char *model = of_get_property(dp, "model", NULL);
 
 	if (!model)
 		return -ENODEV;